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Hi Chenzongliang,

I still don't understand what is difference between proposed feature and
'restore volume from snapshot'? Could you please explain it?

Regards,
Ivan Kolodyazhny,
http://blog.e0ne.info/

On Thu, Apr 7, 2016 at 12:00 PM, Chenzongliang <chenzongliang at huawei.com>
wrote:

> Dear Cruz:
>
>
>
>          Thanks for you kind support, I will review the previous spec
> according to the following links.  May be more user scenario we should
> considered,such as backup,create volume from snapshot,consistency group and
> etc,we will spend some time to gather
>
> the user's scenarios and determin what to do next step.
>
>
>
> Sincerely,
>
> zongliang chen
>
>
>
> *发件人:* Erlon Cruz [mailto:sombrafam at gmail.com]
> *发送时间:* 2016年4月5日 2:50
> *收件人:* OpenStack Development Mailing List (not for usage questions)
> *抄送:* Zhangli (ISSP); Shenhong (C)
> *主题:* Re: [openstack-dev] [Cinder] About snapshot Rollback?
>
>
>
> Hi Chen,
>
>
>
> Not sure if I got you right but I brought this topic in #openstack-cinder
> some days ago. The idea is to be able to rollback a snapshot in Cinder.
> Today what is possible to do is to create a volume from a snapshot. From
> the user point of view, this is not ideal, as there are several cases, if
> not the majority of, that the purpose of the snapshot is to revert to a
> desired state, and not keep the original volume. For some backends, keeping
> the original volume means space consumption. This space problem becomes
> bold when we think about consistency groups. For consistency groups, some
> backends might have to copy an entire filesystem for each snapshot,
> consuming space and time. So, I think it would be desired to have the
> ability to revert snapshots.
>
>
>
> I know there have been efforts in the past[1] to implement that, but for
> some reason the work was stopped. If you want to retake the effort please
> create a spec[2]  sol everybody can provide feedback.
>
>
>
> Erlon
>
>
>
>
>
> [1]
> https://blueprints.launchpad.net/cinder/+spec/cinder-volume-rollback-snapshot
>
> [2] https://github.com/openstack/cinder-specs
>
>
>
> On Thu, Mar 24, 2016 at 6:09 AM, Chenzongliang <chenzongliang at huawei.com>
> wrote:
>
> Hi all:
>
>     We are condering add a fucntion rollback_snapshot when we use backup.
> In the end user's scenario. If a vm fails, we hope that we can use snapshot
> to to recovery the volume's data.
>
>     Beacuse it can quickly recovery our vm. But if we use the remote data
> to recovery. We will spend more time.
>
>     But i'm not sure if the data was recoveried from the backend. whether
> the host need to rescan the volumes? At the same time. If a volume have
> been extended, whether it can be roolback?
>
>
>
>    I want to know whether the topic have been discussed or have other
> recommendations to us?
>
>
>
>    Thanks
>
>
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